An electrochemical study on deformed galvanneal steel sheets

Effect of deformation on the electrochemical behavior of hot-dip galvanized steel sheets

“…2-5). A similar trend is observed by the previous authors [4,10]. The anodic polarization curve shows that as the potential is increased, the anodic current density of the coating tends to become closer to that of the steel substrate.…”

“…Accordingly a correlation of Q 3 to the quantity of coating that remains on the deformed substrate seems to be possible. The difference between Q 3 of the undeformed and the deformed hot-dip galvanized steel sheets specimen gives an idea of the extent of coating lost due to deformation [10]. Using the formula given below, the degree of delamination/ flaking of the coating is obtained and plotted in Fig.…”

Influence of deformation on electrochemical properties of Q235 steel

“…3 that the radius of the arc becomes smaller with increase of the deformation amount gradually. In general, the size of arc in the Nyquist plot is the indictor of the corrosion resistance of material, the greater the radius of curvature, the better its corrosion resistance [9][10][11], therefore, deformation leads to a visible reduction of -3 NaCl corrosion resistance of Q235 steel. The main resource of deformation inducing decrease of corrosion resistance is due to the increase of internal dislocation defects, which also results in work-hardening of metal [12].…”

“…In this paper, steel Q235 is employed to perform the study. Q235 steel is a common used steel due to its advantages of low cost, process ability, relatively high strength and stiffness, it is widely used in building and engineering construction, frameworks, towers of high -voltage transmission, bridges, vehicles, boilers, containers, ships, etc., as well as mechanical parts in cases of no serious performance requirements [7][8][9][10][11]. A new application of Q235 steel pipe is as the base pipe of bimetallic composite pipe by using double metal extrusion method to produce such a composite pipe for pipeline application.…”

Effect of zinc crystals size on galvanized steel deformation and electrochemical behavior

“…In this sense, from polarization resistance studies of uniaxally deformed galvanized steel, a slight increase of the zinc corrosion rate occurs as a function of the deformation degree 17 . It was also demonstrated that the loss in the hot-dip galvanized steel during its formability is high in biaxial mode, intermediate in plain strain mode, less in uniaxial and tensile modes of deformation, and that even in most deformed substrate the galvanic potential value is so negative as to prevent its corrosion 18,19 . All of these results imply that the corrosion behavior of coated sheets can be dependent on the deformation mode, i.e., different regions of the formed sheet may exhibit also different electrochemical reactivity.…”